Is powdered milk the same as liquid milk?!

Powdered milk is a manufactured dairy product made by evaporating milk to dryness. One purpose of drying milk is to preserve it; milk powder has a far longer shelf life than liquid milk and does not need to be refrigerated, due to its low moisture content. Another purpose is to reduce its bulk for economy of transportation. Powdered milk and dairy products include such items as dry whole milk, non-fat dry milk, dry buttermilk, dry whey products and dry dairy blends. Many dairy products exported conform to standards laid out in Codex Alimentarius.
Powdered milk is used for food and health (nutrition), and atypically also in biotechnology (saturating agent).
Calories
Nutritional information for dry milk is based on mixing 1/3 cup powder with 8 oz. of water to make a full cup of milk. A cup of non-fat dry milk contains 82 calories, while a 1-cup serving of liquid non-fat milk contains 90 calories per serving. Among other liquid types, whole milk contains 149 calories, 2 percent has 121 calories and 1 percent has 104 calories per 1-cup serving.
Fat
Fat amounts contained in both dry and liquid milk also differ. In a 1-cup serving of nonfat liquid milk, there's 0.5 g of fat. Whole milk has 7.7 g of fat, 2 percent contains 4.4 g and 1 percent contains 2.2 g of fat per serving. In a 1-cup mixed serving of dry milk, there are 0.17 g of fat per serving.
Calcium and Vitamins
The amount of calcium in dry milk is a bit lower than liquid, with 283 mg per 1 cup mixed serving. A 1-cup serving of nonfat liquid milk contains 316 mg, while whole milk has 291 mg; 2 percent has 296 and 1 percent contains 312 mg of calcium. Dry and fresh milk are equally rich in many other nutrients such as protein, potassium, vitamins A, B12, riboflavin, niacin and phosphorus.
Storage and Loss of Nutrients
Refrigeration of fresh milk is necessary to prevent spoilage. Shelf life is typically a few weeks and is the same for powdered milk that has been mixed with water. However, with unmixed dry milk, the shelf life can last much longer than that of liquid milk as long as it's sealed and stored in a cool, dry place. Once opened, use it within 3 to 5 days or it'll become lumpy. If not used shortly after opening, the flavor also may change and nutritional values may decrease.

http://en.wikipedia.org/wiki/Powdered_mi…
http://www.livestrong.com/article/313491…